Granted Patent
Utility
US 5,622,561 · App. 08/506,176
Particulate material treatment system and conveyor belt mixing system
Inventors:
David Cummins, David L. Roussel
Patented Case
View Patent ↗
Granted: Apr 22, 1997
Filed: Jul 25, 1995
Inventors
David Cummins
David L. Roussel
Assignee (at issue)
Kaiser Aluminum & Chemical Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.